In the late sixties a camp of naïve artists was founded in Trebnje, where since 1968, artists from all over the world gathered every year. For the duration of the camp the artists stayed in Trebnje free of charge and donated in exchange the works created to the town of Trebnje and since 1971 to the Gallery of Naïve Artists. This formed a collection of over 1000 artistic works: paintings, reliefs, and sculptures created by 270 artists from 40 countries. Included are works from artists,whose art pieces are displayed in renowned museums and galleries across the world.

Today the Gallery of Naïve Artists in Trebnje is known as the only collection of naïve art in Slovenia and as one of the more important collections of the kind in the world. The Gallery of Naïve Artists houses a permanent exhibition, works from visiting European galleries and periodically holds independent temporary exhibitions of renowned artists.